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Kazbegi is located on the Khokh Range, a mountain range which runs north of the Greater Caucasus Range, and which is pierced by the gorges of the Ardon and the Terek. At its eastern foot runs the Georgian Military Road through the pass of Darial 2,378 meters (7,805 feet).[7] The mountain itself lies along the edge of the Borjomi–Kazbegi Fault (which is a northern sub-ending of the North Anatolian Fault). The region is highly active tectonically, with numerous small earthquakes occurring at regular intervals. An active geothermal/hot spring system also surrounds the mountain. Kazbek is a potentially active volcano, built up of trachyte and sheathed with lava, and has the shape of a double cone, whose base lies at an altitude of 1,770 meters (5,800 feet).[7] Kazbek is the highest of the volcanic cones of the Kazbegi volcanic group which also includes Mount Khabarjina (3,142 metres).

Owing to the steepness of its slopes, the glaciers of Kazbek are not very large.[7] The total combined area of all of Kazbek’s glaciers is 135 km². The best-known glacier is the Dyevdorak (Devdaraki), which creeps down the north-eastern slope into a gorge of the same name, reaching a level of 2,295 meters (7,530 feet). Kazbegi’s other glaciers include the Mna, Denkara, Gergeti, Abano, and Chata. The recent collapse of the Kolka Glacier, located in a valley between Mt. Jimara and Kazbegi in the year 2002 was attributed to solfatara volcanic activity along the northern slope of the mountain, although there was no eruption. In addition to the 2002 event, a massive collapse of the Devdaraki Glacier on the mountain’s northeastern slope which occurred on August 20, 2014, led to the death of seven people. The glacier collapse dammed the Terek River in the Daryal Gorge and flooded the Georgian Military Highway.

From 24 to 28 May 2019 Caucasus skitouring network organize expedition to survey Mt. Kazbegi height. On 27 May 2019 at 12:22 GMT+4, for the first time, a survey team placed a GPS receiver on the Mt. Kazbegi peak. The new height is defined with the WGS 84 datum. Height was determinate with 5mm accuracy. Defined height is 5053.927m.